Guided Access App Unavailable

I was working on setting up my first ipad using DEP and MDM. As I was starting to restrict it, I setup the calculartor as a single app mode just to see how it works and now my ipad displays "Guided Access App Unavailable please contact your administrator" after entering the passcode and I can't do anything with the ipad. It is totally frozen. If I do a hard reboot "home and power" it restarts and asks for the passcode, but I can't do anything with it.